A water tap fills a tub in 'p' hours and a sink at the bottom empties it in 'q' hours. If p < q and both tap and sink are opened the tank is filled in 'r' hours, then the relation between p, q, r :

$r{\text{=}}p{\text{ }} + {\text{ }}q$$

$\frac{1}{r} = \frac{1}{p} + \frac{1}{q}$$

$\frac{1}{r} = \frac{1}{p} - \frac{1}{q}$$

${\text{ }}r{\text{ }} = {\text{ }}p{\text{ }} - {\text{ }}q$$

A water tap fills a tub in 'p' hours and a sink at the bottom empties

1.	A water tap fills a tub in 'p' hours and a sink at the bottom empties it in 'q' hours. If p < q and both tap and sink are opened the tank is filled in 'r' hours, then the relation between p, q, r :
A.	$\frac{1}{r} = \frac{1}{p} + \frac{1}{q}$$
B.	$\frac{1}{r} = \frac{1}{p} - \frac{1}{q}$$
C.	$r{\text{=}}p{\text{ }} + {\text{ }}q$$
D.	${\text{ }}r{\text{ }} = {\text{ }}p{\text{ }} - {\text{ }}q$$
Answer» C. $r{\text{=}}p{\text{ }} + {\text{ }}q$$

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A water tap fills a tub in 'p' hours and a sink at the bottom empties it in 'q' hours. If p < q and both tap and sink are opened the tank is filled in 'r' hours, then the relation between p, q, r :

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